Yuka Koshino is a researcher on foreign relations and security, defence and technology policy with a focus on Japan and US alliances in the Indo-Pacific region. As well as serving as an Associate Fellow at the IISS, she is an International Strategy Forum Fellow at Schmidt Futures and a David Rockefeller Fellow at the Trilateral Commission.

Yuka was a member of the IISS research team between 2020 and 2023, serving as Research Fellow for Security and Technology Policy (2022–23) and Research Fellow for Japanese Security and Defence Policy (2020–21). She is the co-author of Japan’s Effectiveness as a Geo-Economic Actor: Navigating Great-Power Competition (Routledge, 2022) and co-editor of Japan and the IISS: Connecting Western and Japanese Strategic Thought from the Cold War to the War on Ukraine (Routledge, 2023).

Prior to joining the IISS, Yuka conducted research for the Japan Chair at the Center for Strategic and International Studies. She also provided policy and business analysis on Asia's high-tech and defence industries at the Avascent Group and the Asia Group in Washington DC. She previously reported and published news stories on Japanese political, economic and business affairs for the Wall Street Journal, Economist and Japan Times. She graduated from Keio University in 2016 with a BA in law and received an MA in Asian studies from Georgetown University’s Walsh School of Foreign Service.